Control for electric elevators.



D. C. LRSOII.

CONIROL FOII ELECTRIC ELEVATGRS. Y

APPLICATION FILED OCT- 2. 1914.

Wl T/I/ESSES t da. ieu dillo (155 yui/wm t may concern;

Be it known that l, Darin C. Lansorr, a eiuisen of the United States, residing in Yonkers, in the county of lllestchester and tdte of New York, have invented a new and useful linproveinentin Controls 'for Electric Elevators, of which the following is a specification. y

lily invention relates to an improved oontrolling system for electric elevators, and more particularly to that type of electric elevators employing direct current inotiife power.

iCine ot' the objects of the invention is to provide a simple and eiiicient electric centroller for elevators arranged to eliminate so far possible, the usage otl auxiliary contacts and accompanying complications,

Another object of the invention is theL provision of ineans employing as one of the agencies, a shunt eld for effecting' a dynaniic lii'ale action on the inotor together with a novel method of controllingthe saine.

@ther novel features of the invention will be pointed out hereinafter, the novel coinhinations ot elements being set forth in the appended claims.

The accompanying drawing, represents diagraiiinnitically a4 two speed electric `elevator controlling systein embodying iny invention.

l will iii'st designate the various parts, and thereafter' point ont the sys'iein ot circuits showing how they act on the dili'erent parts to etl'ect the desired results.

iii elevator car (l, is provided with a controlling switch S, the cai' being operatively connected to an electric inotoi' M hy ineans of the usiial suspension cables. il niain line or soiirce of electrical supply is designated -iand while l) is a potential switch.

lilie motor M is preferably compound wound.r having a shunt and series field desn L.

igi'iiated l) and il` respectiiely, Liic diieciion ot rotation ot the inotor being' controlled hy reversing' switches l, ll. iin accelerating.;-

magnet is shown at H, and c.f iiipi'iscs a single inakg'iiet operating' a series ot contacts such as l, 3, el, which control a starting .,tai'ice (l, and se ies lield Ytopping is shown a, and

sii" magnet operating a series ci" contacts si cli as 6 and i', f-'liicli control a stopping Specification of Letters Eatent.

resistance l'.

i stop niotion switch i shown at L, and comprises piiiraiity use; it being siiliicient to state that the rod 8 and connected Canis, are rotated iii one direction or vthe other at the limits et car travel by ineans otl a traveling nut on the hoisting drinn shaft, oi' in any other iif'ell known way. A brake is designated by' and is arranged to apply a tric-tion l'iia to a pulley on the motor shatt et a weight oi' spi'i ing the travel olf thi, car hy electroniac'net. il fast and slow switch is shown at lil, and coni prises a net which when enaijzed, 'inoi i disk l2 out of engagement with c' and ll, controlling,r a resistance la iii se with the shunt field winding` ot Door contacts are designate-il ineral i6. lin'iit switch contacts liv the niiniei'al l?, and slaci; calile switch contacts liv the niiiiiei'al l5. Each of the switches la and li is ot the solenoid type`r coiiipi'isl ing magnet windings such :is l), 2() and il,

tiie motor.

iii' tric niiwhile the switches ll and i are also provided with the well known terni of hold down coils designated 20 and 2l. i satcty switch in thc elevator cai' is iicsiiriiatcil s.

The parts as shown are iii th positions with thc cai' at rest. new

assiiine that the operator in the cai' desires to go iip and that lie nieves the switch lfwer to the lc'lt into engagement with the contactsegiiieni A circuit is ilici'clij.' established for the windings lf and 2() oi" th pi'itcntial switch and reversing' switch l, s', `windings being' connected iii series as iilloii's: i"i'oiii IP iiiaiii to wire '2i-3, c. r gate contacts 24 to safety switch s. wire 25 to sciijiiient li waiY ot the cai' switch lei'eigiwire 2li, winding 20. conductor '27, to stop nrtioii switch wire 29, through tl switches7 slack calile swi'cli and i contacts to ,'i'indiiig if) hy way et wire 30, and thence to the line lijf-way' elE wire 3l. rllhe winding lf? and .'20 new" beir gized, ei'iect operation of tlA switch and reversing switch il, t'

l s i ie liinit l tablishing av circuit to the motor and brake.

the inotor can start to raise the The niotor circuit may be traced from the main, potential switch contacts 32, wire 38, reversing kswitch contacts 84, wires 35 and 3G, hold down coil 21. wire 37, through the bottom pair ot' contacts 3S, 38', to wire 39, contact ett), to wire 50, armature brush 51, through the armatureto brush 52, wire 53, to wire 54, by way of contacts 55, resistance G, wire 56, through the series ield to wire`57, and troni thence through contacts 32 to the line. The brake releasing magnet 58 isconnected in parallel to the circuit just traced, being connected preterably at a point 59 substantially midway on the stopping resistance K, which 4is preterably a low resistance, the parallel circuit being traced as follows: from the junction 35', wire G0, through the left section of the resistance l, to junction 59, wire 6l, winding 58, junction 58 and troni thence to line via wires 62 and `3l. The shuntfield receives current via the junction 33', wirel 63, contacts 13, 14, via the disk 12,. wire 54e, through the field D to junction 57, and from thence to line via` wire 57 and con tacts 32. rlf'he brake being now released, elevator, both'feld windings being energized. The motor will now run at slow speed, since the current flow to itsfarn'iature and series field winding is limited by the starting resistance G in circuit therewith.

The accelerating magnet is connected in a well known manner in a circuit which is in parallel to the motor armature, its operation therefore depending on the C. M. F. of the motor. The accelerating magnet is arranged automatically to first cut out the starting resistance G in step by step order` and. finally the series field winding` l?. In this nianner the niotor speed increases, and runs at its normal slow speed a shunt machine.

t is to bc here noted that the contacts l which are the irst in order ot operation by the accelerating magnet, control auxiliary contacts l', which now closes a shunt circuit around the car switch contacts and the reversing switch operating winding, which may `nc traced troni the lmain, wire contacts switch s, wire 6?. resistance (34, wire 35, contacts l", \\ire.,($t, to wire QS), and troni thence to the -lline through the circuit including the liinit and slack cable switches, the door contacts, and the potential switch windingl l). rlhis parallel connection is productive ot' an important result which will be hereinafter clearly set forth.

ln order to increase the speed ot the niotor, the operator-moves the switch lever to engage the contact segment This operation establishes a circuit for the winding 67 et the tast and slow l 't which may 3e traced from the main. wire a T f 23, contacts, to the switch lever via `manner the shunt field is weakened., cansAL which causes the motor to run at a reduced net-11,561

s and wire 25, segment. 22?", wire 68, stop motion switch 69, wire 70, wi ding 137 and ron'i thence to line by wa),4 or' Vwires and 3l. `The switch E new operates to the disk l2 out of engagement. with tacts 13, le, thereby inserting the. r l5 in series with the shunt ll.

the motor -to increase :its speed, and e elevator car now travels at its nornial speed.

ln order to bring the elevator car to rest, the operator moves the car switch lever .toward center position to disengage the seg nient 22. This results in open circuiting the magnet (37 et the switch E. whicfiL now closes, thereby short circuiting` 'the vheld resistance l5, and strengthening the iield l),

speed. The continued movement ot' t switch lever toward center to disengagc tne segment 22, open-circuits the winding 20 and thus the reversing switch R opens i s upper vcontacts 34, 55 and closes its bottoni contacts 7l, 72. The opening ot the switch R opens the motor circuit, also the ora-lie circuit and the circuit ot' the accelerating niagnet H troni the main line at the contacts 31* and and closes a local or dynamic brake circuit around the motor by nieans ot the lower contacts 7l, 7:2, this circuit including variable stopping resistance E. Thislccal or dynamic' .brake circuit may he ti from the arniature brush 5l, which new positive and may be considered as `glas, wires 50 and 39, to wire 37 riathefhot'tor contacts on the switch lt', hold dowv l i 2l', wires 3G, 60, resistance l, wire' '3 te junction 73, wire 74, hold down coil 20', and thence to brush 52, via the bottoni contacts on the reversing switch and wire 53. The motor now lng driven by load acts as a separately excited ger and sends current through the (lj-,nan cuit, resulting in a dynamic brake or dation on the inotor tending to bri rest. lt is to be here noted that the shunt ield remains fully excited through alsnostf the entire period ot deceleration, thus ei;- erting a field oit constant strength which rc suits in a strongel and more powert'ul di.'- nainic braking' action, as compared with that achieved by the introduction ot an),v entra eld 'inding and a resistance in series with the niotor, which is now the connnon practice. The shunt winding as will be noted isv controlled by the potential switch, w .1h in turn is controlled by the auxiliary tacts 1 controlled by the Contact4 ot accelerating magnet. New by reason of construction the accelerating which is in accordance with .that shown 'he patent l l `nf the.

it t@ lou: 1'4

nee T6 in parallel with the circuit lne resislunee si, ilus resulting" in e, (l Tnali e action which brings the inosliill slower speed. ln YClie meanwhile n fiieiien sliep ef tlie ino-for elleelell 'by the frie'ion brake B5 rfliieli is npigliecl llv :final easily. This gradual lum nini eue); lirnling neion if; elle le-il by providing n puin ol relnively lligli im. .'nnee i'ei ille brake magnet il linrgeA lie eireui, leuning' auch pngli ineli'ulee Nl'ie relnivelj! liigfli resislgnnee 77 wliieli is nernnlly inniniznnecl in parallel circuit with ille brake Winding' lirougli li'e sie?) inotien switches T82 Y f' reason ni ille eonneeion of S magnet J iliieell Crees the nf's, "alie sinne will egel'nle its coi :norteireuit nuire or oi ille Leni@ n bhe dynamic ni-alize eireuie n lie l1. lll.. F. of the meier. qieerring now more pnrtieulnly o ilie il flown coils 2O` 21, ily will ne noie@ linie l; ynuniie brake. current eoiliping'? sees lirougli bolli of these. Coils, le v it l be observed tiin; tlie reversing svfielies ire in their open or lowernms, posiiei'n i n lius; Se long` es the meier is generating any ninneeizible nmol n# of eurren it will be iinpossilile lio 'el-one either of these Snfileiieei. llurilierniore ilv will be noted 'hnl ille Conlneis i, upon el ring; in" -r the resieinnee 5l in pnrnilel willi the einer oi 'die ieeieising Swteli winilinge 2O or 2L dependen?, of Course on lelie lireel'i Ylie enr Switeli. Tliig resu :such winding' le suelo exi le liolil tlienevereingg swie L i ,iS Closed ion, tlnif is so long ne llie enr swiieli inniulnins lie eireui therefor, but Sireng'li noi being' sulleien "zo ngnin el'ieet :i fleeing; of 'Elie swiieli (ne foy efeznole lijf centering' 'Elie enr swieli und qnielily ine-wing ii 'to :in operated position :ig-nin) unil *elle @onlne-iss i have opened. Thus there eau loe no ponsibiliy oi' :10min slurtiug the nlolor or n minne il le reverse unless und until it liars sul)- stunlinlly come lo rest, or in other words, nler ille contacts l, l' nre opened.. which effected upon Adie deceleration oi" llie inolor lo npprexiinnlely one quarter of its full ieeil. li`iiitl1ei'mo1'etliis feature ins zres that.

J dynamic brake action on ilie inoior in inning, ennnot be interfered Willi by 'the ei'nor in tlie enr. lliuei permitting 'ine i. inenclecl Willioni interzei'enee of my kind. ilse wlien one or llie olier of 'lne reversing noior lo Colne Snbsiinliially le ne il; is

swil'elies ie closed 'to esl biisl the mol; r eirl enit, die held down coil el? #Sie o'neiD rever:- ing snfiteii teneis 'te lioiil the booni contacts thereof in lii'in electrical engagement, nud prevents the operation el ilie lnlzcer swilieli if for any reason ils winding' be neeiilennlly energized as might occur in euse oil :in neer denial Short elieuiior ground on falle system. ils si matter of fact, if it is so ldesired7 the held down coils muy be dispensed Wit-l1, und llie leiter explained einzig' ille reversing' switch windings or n, parallel resisnnee controlled by l'lie :ieeelerzi'eing inagrne, nin): be reliei; noon lo eli'eeui L i elly prevent sudden reversal [if the meier.

it 15 desired 'Le operulii lie eer in i ileseeniing ilu'eeion, ille .Swilrli lever n; moved toward the right. ',lflns movement of lie lever effects the ope ii-tion el the revereinggj sn'iteli R", anal Closes n Circuit lio die nio'or effecting its opera 'On in u reverse fliifeeiiou to that lliereeiere deserilieil. yl`l1e renniinine nii-ts operaie in u nninner ne llere- Will new point one ille operul'ion of llie e'iop niet-ion mechanism, il; being umlerstooil that this nieelnuiisni operates onlyY :it tlie liniis oi enr tnif'el in bolli (lireeions.

Assuming the eur to be ascending zit Jfull speed willi the enr Swieli lever inninl'uiiwd in ils ext-.reine left lninil position. is the enr apioaelies iis upper linii of lrnvel, rofl. 8 und connected cams l?, l() :mil ll will rotate in n left lnincl or finti-clockwise direction, we will say for exznnple. lh; rene-(iin of ille funi einiges, the switeli {Si} will einen firsty liere'oy inierrupling ille eireuii to elle l' 'si und slow Speeil magnet sxnelifi. :in-fl winning l'lie lullier lio glior eireui lie remsinnee if lxerelly erengg'ilieuing lie sliun lielli n il slowing (lo fn lire motor. Si lurlier roi; ier. oi *.'lie

e e'leelS ille openingr of li v-:lieli open eireuiis the nnee 77, :ind .inaniediinely n'lerwniwl Swi'leli r is opene'l ille which ineriupls llie all enit of the operating inzig'nei 2l) of 'the rerersing' swiieli E, permiting Ihe lulter lo open unil thus (liseonneet ille motor from ils supply eireuitV ii'ml pulling info operation the (ljfnmnic ornlie mul irieion brake, ille latter being applied instantly with ull since lxe ilieeliurge eireuil ille 'elfor including ille parallel resistance 7T is now open eireuitecl. The poli-nihil su'iifli in this instaure is opened in u manner ne heretofore (leseribeil, ihn is, upon ille opening of the neeelerniingV contacts L l.

l. is to be here pointed out llint when the pol'enlinl switch i5 opened ilireetlyns for example in :i euse of emergency, by in mns olI ziniounl7 thereby eli'eiing u :irrungeznent oi Weakpower,

to he connected parallel With'the i'irst naine-,d resistancei for every stopping operation or the motor.

l2. ln an elevator, the combination with a shunt wound motor. a main line circuit, and meansrtor etleeting a dynamic braking action on the motor` comprising the shunt field connected across the main line circuit` a Variable automaticallyy controlled resistance connected in a dynamic lirale circuit around the motor, and an additional resist-- ance arranged automatically to he connected in parallel with 'the first named resistance at every stopping operation of the motor when the speed or the motor has been snhstantially reduced.

lt". ln an electric ele 'aten the combination vwith a rar. ot a shunt Wound motor. a

mai; line circuit, and means for etlecting a dy nic braid-ng action on the motor when stoppinoj, comprising the shunt tleld connected across the main linel a resistance controlled hy the Taifing potential ol the motor connected in a local or dynamic "liralre circuitv around' the motor, an additional resistance adapted to be connected in a parallel circuit with the named resistance, and an electro-responsive switch controlled nianlially from the car in starting and automatically hy the motor in stopping'. Yfor controlling` the shunt field and the said additional resistance.V

l-l-V. ln an electric elevator, the combination with a car, ot a shunt wound motor, a main line circuit, means tor effecting a. dynamic action on the motor comprising the shunt lield, a variable resistance controlled vby the motor connected in a dynamic brake ci lcuit around the motorc an additional resistance and a potential switch controlled manually troni die car upon starting, and zuitonnitiiailly hy the motor upon stopping,

adapted when in one position to connect the Y mint tield across the line, and when in another position to disconnect the said field a?, connect the said additional resistance in parallel with the first named resistance.

lf). an electric elevatora the combination with a car, of a motor having a shunt tield Winding, a main line circuit, a. stoppine` resistance, a stopping magnet controlled the motor for Varying the said resistance` lreversing` switch mechanism arranged when open to connect the said motor and resistance in series iii-a dynamic brake circuit, an additional resistance, and a potential switch controlled manually from the car in starting' and auton'iatically by the motor in stopping, arranged when closed to connect the shunt tir-,ld across the main line, and when opened to disconnect the said eld and connect the Liaid additional resistance in a parallel circuit across the motor.

lll. an electric elevatorv` the combination tl; a car7 et a motor having a shunt field Winding, an automatically controlled resistance, electromagnetic switch apparatus arranged to connect the said resistance in a local or dynamic liraler circuit upon stopping the motor. an additional resistance, and a potential switch controlled manually from the car in starting, and automatically hy the motor in stopping, the switch loeingarranged when closed to connect the shunt field across the main line circuit,.and when opened to disconnect the said iield and connect the said additional resistance in a parallel circuit with the first named resista 1T, ln an electric elevator. the combination with a car. a manual 'itch in the car, a motor having` a shunt eld Winding, a resistance, a potential switch controlling the Field and the said resistance, a reversing switch tor the motor5 operating windings tor the said switches arranged in a series circuit and controlld hy the car switch, a series starting' resistance for the motor, means controlled by the motor for varying the said resistance7 and means controlled hy the resistance-ralying-means for coirrolling7 a parallel circuit tor the potential switch winding.

18. ln an elevator, the combination with a car.- of a shunt Wound motor, and means controlled manually from. the car, and automatically by the motor for every stopping operation of the motor for controlling the shunt field.

19. ln. an elevator, the combination with a car, of a shunt wound motor, and means controlled manually from the ear upon starting, and automatically by the motor tor every stoppingl operation of the motor for controlling the shunty lield.

20. ln an elevatore the combination a car, of a shunt Wound motor, and an tro-responsive means controlled rzanually from the ear upon starting and autoi latically by the motor .tor every stopping` oseration of the motor tor controlling the shunt field.

2l. In an elevatori, the'comhination with a car, a manual switch in the car, a motor having` a field Winding, and. an electr -magnetic switch controlled by the manual su 'upon starting and by' the motor for every stopping operation ot' the motor for controllingr the lsaid field Winding.

22. lnan elevator, the combination of a shunt Wound motor, a main line eircuit,'and means for connect-ing the shunt field across the main line circuit, and for maintaining the said connection until the speed o' the motor is reduced for every stopping operation o the motor substantially as described.

23. ln an elevat r, the combination with a earj of a manual. switch in the car, shunt i rin `|wound motor, a main line circuit, and electro-responsive means controlled manually frein the car upon starting and automatiec-i id A the motor upon stopping for conthe lield winding for every stopn operation of the motor.

an elevator, the combination with a cer, et tiinanual `witch in the 0511,21 shunt wound motor, a main line circuit, en electromagnetic switch controlled by the car switch for connecting the shunt iield across the line upon starting the motonend additionalv eration of the motor, subst-entiall?,7 as decrioe l.

in sn eleretor, the combination of a shunt motor, accelerating mechanism for the motor, and e potential switch controlled by the accelerating mechanism upon stopping, for c strolling the iield of the motor.

2?'. ln an elevator, the combination with a car, et" s shunt inotor, a cer switch., a niain line circuit, a potentiel switch controlled by the car switch for connecting the field of the motor across the line upon starting,

lectrorcsponsive accelerating mechanism or i he motor.v and ineens controlled by the eruting nicchanisn'i for maintaining the shut lield connection until the motor is reduced,substantially described.

shunt motor, a cer switch, a poteni having au operating,r magnet and circo t, therefor controlled by the cnr witch, the seid switch controlling the field indii g f the motor, and means for clos additional circuit Jor the potential ieratingr magnet winding iudepeudi the circuit for said windingnconiled 'hy the car switch.

9,9-, ln an elevator, the combination with cor, a cer switch, of e shunt motor, a potentie-.l switch controlling the field of the said motor, und having an operating magnet and circuit therefor controlled by the car switch, a resistance, and means controlled hy the in otor i'or establishing a circuit inconnection during every period vof de# in an elevator, the combination with a` cluding the said resistance end the potentiel switch operating magnet windine.

30. in nn elevator, the combination with a car, ot shunt wound motor, a cer switch, a potential switch controlling the liel'd ot' the said motor sndhaving an operating mag- -net winding1 and a circuit therefor controlled winding, a potential switch controlling the said field, a reversing switch for the motor, operating windings for the said switches arranged in :i series circuit controlled by the car switch, and means controlled by the motor for controlling a parallel circuit for the said reversing switch Winding.

32. In an elevator, the combination with a car, s car switch, n. motor having a shunt i iield windin', a potentiel switch controlling@ the shunt field circuit,a reversing switch for the motor, operating windings for the seid switches nrranged in a series circuit controlled hy the car switch, electro-responsive accelerating mechanism for the motor, and n circuit for the winding of the potential switch parallel to seid reversing switch winding and controlled by seid electrode sponsive 1 accelerating mechanism for the motor. l

33,. in an elevator, the combination with the car, a cer switch, a shunt motor, a. p0- tential switch controlling n circuit for the inotor field, a reversing switch Jfor the motor, operating magnets and circuits for the said switches controlled by the cnr switch, accelerating mechanism for the motor, a resistance, and a circuit vfor the winding; oi the potential switch in shunt to the reversing),` switch Winding, said shunt circuit including the said resistance and being controlled by' the said eccelera'ting mechanism.

ln testimony whereof, l have signed iny naine to this specification in the presence of two subscrilliiiigI witnesses..

AVH) C. LRSON.

l/Vitnesses z llVAL'riLn C. STRANG, intens (i Bernier. 

